CAT5137 Series

Digital Potentiometer (POT), 128-Tap, with I2C Interface

Catalog

Digital Potentiometer (POT), 128-Tap, with I2C Interface

Part	Number of Circuits	Configuration	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Temperature Coefficient (Typ)	Resistance (Ohms)	Number of Taps	Tolerance	Resistance - Wiper (Ohms) (Typ)	Taper	Interface	Mounting Type	Package / Case	Memory Type	Voltage - Supply [Min]	Voltage - Supply [Max]
ON Semiconductor CAT5137SDI-00GT3	1	Rheostat	85 °C	-40 °C	SC-70-6	300 ppm/°C	100 kOhms	128	20 %	85 Ohms	Linear	I2C	Surface Mount	6-TSSOP SC-88 SOT-363	Volatile	2.7 V	5.5 V

Catalog

Digital Potentiometer (POT), 128-Tap, with I2C Interface

Key Features

• Single Linear digital POT with 128 Taps

• End-to-End Resistance of 10 kΩ, 50 kΩ and 100 kΩ

• I2C Interface

• Wiper goes to Midscale at Power-up

• Digital Supply Range (VDD): 2.7 V to 5.5 V

• Low Standby Current

• Industrial Temperature Range: -40°C to +85°C

Description

CAT5136, CAT5137, and CAT5138 are a family of digital POTs operating like mechanical potentiometers in various configurations. The tap points between the 127 equal resistive elements are connected to the wiper output via CMOS switches. The switches are controlled by a 7-bit Wiper Control Register (WCR) via the I2C serial bus. CAT5136 is configured as a variable resistor. CAT5137 and CAT5138 are resistive voltage dividers, with one terminal of the potentiometer connected to GND. CAT5137 and CAT5138 have different device IDs, which makes it possible to use both on the same I2C bus. Upon power-up, the WCR is set to mid-scale (1000000).